Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b5ca388c9e6839…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 07:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c66d631c3ef98e8d0e10c892e64bc8f SHA-1: 647b97a20caad9562c0120a614529cf994ee3954 SHA-256: d7b5ca388c9e68391b3be882ba497e4da963c5f8bfc3af3a92ed9396de83c14a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hondaototanan.com/upload/files/91404609699.pdf In PDF document text
    • http://ecolservizinettuno.com/userfiles/files/89087131653.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/advlgokt1ojf00bp9lruumgem1/suvabewobud.pdfIn PDF document text
    • http://vkts.se/userfiles/file/99437050498.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/gavatekigenapuvoguwaworu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8edcfdfa---lifipewig.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/rigowisulewesevev.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/mumofovugutugatig.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161348a7c9d794---33853378175.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/544793402.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210904034614.pdfIn PDF document text
    • http://dsraxys.com/uploads/faxinurajabaparenunuko.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b714f24325---98040198719.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/90533140489.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/30804609955.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/pigotemepubebanadomi.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/luziradonasisexu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/donikelorajefigazoz.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/volupujewapetitenof.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/vavewewupi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090e98befe---61926399571.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_080521.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/14326758803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=equalizer+fx+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDE 14852 bytes
SHA-256: fc5821e114339962d811681eca042dab91da1edbc6aadee1a75e96edc7c8f5c9
font_01_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 10252 bytes
SHA-256: ce443fbf904889ab8f87dc5d851065a247a8e90e18d0c9f405243a24ce43949d
font_02_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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